Antenna filter and electronic device comprising same in wireless communication system

Abstract

The present disclosure relates to an electronic device for radiating an output signal in a wireless communication system. In one embodiment, the electronic device includes: a power amplifier configure to receive an input signal; a splitter connected to the power amplifier, which a plurality of branches; a plurality of filters connected to the plurality of branches of the splitter; and a plurality of antenna elements connected to the plurality of filters. The plurality of antenna elements radiates the output signal that is a portion of the input signal received by the power amplifier.

What is claimed is: 
     
       1. A device for radiating a signal in a wireless communication system, the device comprising:
 a power amplifier; 
 a plurality of antenna elements; 
 a splitter connected to the power amplifier, wherein the splitter branches a signal from the power amplifier into a plurality of paths, wherein each of the plurality of paths is connected to each of the plurality of antenna elements; and 
 a plurality of filters, wherein each of the plurality of filters is arranged on each of the plurality of paths, respectively, based on a phase difference between adjacent paths; 
 wherein the phase difference is determined based on a number of the plurality of filters. 
 
     
     
       2. The device of  claim 1 , wherein:
 the plurality of antenna elements comprises a first antenna element, a second antenna element, and a third antenna element, and 
 the plurality of filters comprises:
 a first filter arranged between the first antenna element and the splitter, 
 a second filter arranged between the second antenna element and the splitter, and 
 a third filter arranged between the third antenna element and the splitter. 
 
 
     
     
       3. The electronic device of  claim 1 , wherein;
 the plurality of antenna elements is included in a sub-array, and 
 the splitter comprises an N-way divider according to a number of the plurality of antenna elements. 
 
     
     
       4. The device of  claim 1 , wherein a specified rated capacity of each of the plurality of filters is lower than input power transmitted from the power amplifier to the splitter. 
     
     
       5. The device of  claim 4 , wherein the specified rated capacity of each of the plurality of filters is greater than or is equal to a value obtained by dividing the input power by the number of the plurality of filters. 
     
     
       6. The device of  claim 1 , wherein the plurality of filters are arranged such that a sum of reflected waves by incident waves on the plurality of filters is minimized. 
     
     
       7. The device of  claim 1 , wherein the plurality of filters are arranged such that a sum of reflected waves by incident waves on the plurality of filters becomes zero (0). 
     
     
       8. The device of  claim 1 , wherein the plurality of filters are arranged such that a portion of reflected waves with respect to incident waves on the plurality of filters is canceled due to phase differences of the portion of reflected waves. 
     
     
       9. The device of  claim 1 ,
 wherein the plurality of filters are arranged on transmission lines with different lengths, respectively, such that the plurality of filters are arranged in an order of phase shift, 
 wherein the phase difference between adjacent paths meets θ d =360/2N, and 
 wherein the ‘θ d ’ is the phase difference and the ‘N’ is the number of the plurality of filters. 
 
     
     
       10. The device of  claim 1 ,
 wherein the plurality of antenna elements comprises a first antenna element, a second antenna element, and a third antenna element, 
 wherein 
 the plurality of filters comprises:
 a first filter arranged between the first antenna element and the splitter, 
 a second filter arranged between the second antenna element and the splitter, and 
 a third filter arranged between the third antenna element and the splitter, and 
 
 wherein the first filter is arranged in a position inducing a first phase shift from the splitter, 
 the second filter is arranged in a position inducing a second phase shift from the splitter, 
 the third filter is arranged in a position inducing a third phase shift from the splitter, 
 a difference between the first phase shift and the second phase shift is 60 degrees, 
 a difference between the second phase shift and the third phase shift is 120 degrees, and 
 a difference between the first phase shift and the third phase shift is 180 degrees. 
 
     
     
       11. The device of  claim 1 , further comprising a printed circuit board (PCB), wherein:
 the plurality of antenna elements are arranged on an upper surface of the PCB, and 
 the plurality of filters are arranged on a lower surface of the PCB. 
 
     
     
       12. The device of  claim 1 , further comprising at least one processor configured to provide an input signal to the power amplifier,
 wherein an output signal radiated by the plurality of antenna elements is a Radio Frequency (RF) signal. 
 
     
     
       13. The device of  claim 1 , wherein the splitter is directly connected to the power amplifier. 
     
     
       14. The device of  claim 1 , wherein the plurality of filters comprises at least one of an elastic filter or a ceramic filter, and
 the elastic filter comprises at least one of a Surface Acoustic Wave (SAW) filter or a Bulk Acoustic Wave (BAW) filter. 
 
     
     
       15. A Multiple input Multiple output Unit (MMU) device comprising:
 a plurality of power amplifiers; 
 an antenna array comprising a plurality of sub-arrays, 
 wherein the plurality of sub-arrays comprising a first sub-array, the first sub-array comprising:
 a plurality of antenna elements, 
 a splitter for branching a signal into a plurality of paths, wherein each of the plurality of paths is connected to each of the plurality of antenna elements, and 
 a plurality of filters for filtering a specific frequency band, wherein each of the plurality of filters is arranged on each of the plurality of paths, respectively, based on a phase difference between adjacent paths, wherein the phase difference is determined based on a number of the plurality of filters. 
 
 
     
     
       16. The MMU device of  claim 15 , wherein the splitter comprises an N-way divider according to a number of the plurality of antenna elements. 
     
     
       17. The MMU device of  claim 15 , wherein a specified rated capacity of each of the plurality of filters is lower than input power transmitted from the plurality of power amplifiers to the splitter. 
     
     
       18. The MMU device of  claim 17 , wherein the specified rated capacity of each of the plurality of filters is greater than or is equal to a value obtained by dividing the input power by the number of the plurality of filters. 
     
     
       19. The MMU device of  claim 15 , wherein the plurality of filters are arranged such that a sum of reflected waves by incident waves on the plurality of filters is minimized. 
     
     
       20. The MMU device of  claim 15 , wherein the plurality of filters are arranged such that a sum of reflected waves by incident waves on the plurality of filters becomes zero (0).